I clean the outside of our house with bleach to remove dirt and mildew, it saves painting it. Use a bottle that hooks to the water hose, you may not need a bottle full of bleach. Get the bottle from a Hardware store or where they sell plants, Lowe's may have them.
After using the bleach be sure and wash the bleach off with clean water a few minutes after applying the bleach, or you may be disappointed with the results.
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